Which of the following correctly lists the structures according to the sequence of fluid flow?
A. lymphatic capillaries, interstitial spaces, blood capillaries, lymphatic vessels, lymphatic ducts, subclavian veins.
B. blood capillaries, lymphatic vessels, interstitial spaces, lymphatic capillaries, lymphatic ducts, subclavian veins.
C. blood capillaries, interstitial spaces, lymphatic capillaries, lymphatic ducts, lymphatic vessels, subclavian veins.
D. blood capillaries, interstitial spaces, lymphatic capillaries, lymphatic vessels, lymphatic ducts, subclavian veins.

Lymphatic system is one of the most important system of the body and the part of the vascular system. This system also plays an important role in the immunity.

Various substances like lymph fluid, ions and immune cells flow in the lymphatic system. The fluid flow from the blood capillaries to the lymphatic capillaries via the interstitial spaces. From the lymphatic capillaries the blood flows into the lymphatic vessels then into the lymphatic ducts and finally into the subclavian veins.

Thus, the correct answer is option (D).